Diamond-drill core-breaker



`(No Model.)

vJ. 1. GRISGOM. DIAMOND DRI-LL vGORE BREAKER'. No. 327,942. Patented ont. 6, 1885.

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, UNITED STATES PATENT OEEIcEo JOHN I). GRISOOM, OF POTTSVILLE, PENNSYLVANIA.

DIAMOND-DRILL CORE-BREAKER.

SPECIFICATION forming part of Letters Patent No. 327,942, dated October 6, 1885.

Application tiled May 20, 1885. Serial No. 166,121.

To all whom t may concern.'

Be it known that I, JOHN P. GRIsooM, a citizen of the United States, and a resident of Pottsville, Pennsylvania, have invented certain Improvements in Diamond-Drill Gore- Breakers, of which the following is a specilication.

My invention consists of certain improvements in the construction of diamond drills, designed mainly with a view of avoiding wear on the core-breaking devices, as fully described hereinafter.

In the accompanying drawings, Figure 1 is a longitudinal section of the bit end of a drill embodying my improvements. Fig. 2 is a vertical section of a core-breaking and corelifting tube as made in two parts, and shown detached from each other and from the case or barrel. Fig. 8 is a section on the line 1 2, Fig. 1, and Fig. 4 is a section on the line 3 4, Fig. 1.

Referring to Fig. 1, A represents the bit of a drill, and B is a tube, into the lower end of which the bit is screwed, while into the upper end is screwed a coupling-ring, D, for securing the tube B to the drill-rod.

In the singlebarrel diamond drills of the character illustrated in the drawings it has been usual to provide the barrel or case with wedging-pieces, which, on the withdrawal of the drill, grasped the core and broke it off, so as to pull it out with the drill-tube; but as the wedging-pieces rotated with the barrel about the core they rapidly became worn too thin to perform their duty, and they would also break up the core by catching against it as the said wedging-pieces revolved with the drill. To remove these objections, and yet insure the breaking of the core without the use of a separate tool, I mount the wedging piece or pieces ina cylinder which is free to turn independently of the barrel and drill. In the present instance I have shown two of these wedging devices, E, consisting of dovetailed pieces adapted to dovetailed grooves e, with inclined or tapering seats in the tube or cylinder F at one side thereof. This cylinder is free to turn independently of the barrel B, so that the tube B and the drill may revolve, while the cylinder F, carrying the wedgingpieces, will remain stationary by frictional contact with the core. The cylinder F is (No model.)

mounted between an annular shoulder, b, near the lower end of the tube B, and a ring,

d, interposed between the upper end of the cylinder F and the lower end of the coupling D. I prefer to provide this cylinder F also with grasping-fingers G, which are shown inV the present instance as consisting of four springs riveted to the lower end of the cylinder F and projecting outward at their upper ends, so as not to interfere with the free descent of the drill-tube over the core while giving a firm frictional contact therewith to prevent the turning of the cylinder F, and

also to grasp the core to assist in withdrawing it when it has been broken off. In the present instance I have shown the tube F as being made of two parts for convenience of manufacture, one part carrying thewedgingpieces and the other the grasping-fingers, and the two being united by means of the groove and tenon f, Fig. 2, so that one cannot turn Without the other. In some cases the grasping-fingers may be dispensed with, the wedg- 7 5 ing piece or pieces alone being relied on to grasp the core, as well as break it.

When the core, as indicated by dotted lines in Fig. l, has become of such length by the drilling operation as to require its removal, 8e

its upper end will have passed the upper end of the cylinder F, so that on attempting to withdraw the drill the points of the wedgingpieces E, owing to their frictional contact with the core, will slide down their inclined seats, and, being on one side of the cylinder, will press the core to one side, as shown in Fig. 4E, with the nal result of breaking it off near its base, so that the core will be withdrawn at the same time as the drilling-tube. 9C

Owing to the above-described independence of the wedge-carrying cylinder F from the drill-tube, the wearing away of the wedging-pieces by turning against the core, and

also the breaking up of the latter from the catching of the wedging-pieces against it, are prevented.

Although I have shown two wedging-pieces in the drawings, one ormore maybe employed without departing from my invention.

My improvements may be applied to other forms of diamond drills than the single-barrel drill shown. For instance, in an application for a patent filed of even date herewith, Serial No.

IOO

161,122, I have shown its application to a drill having inner and outer barrels, the inner barrel in that case constituting the cylinder which carries the Wedging piece or pieces, and which is free to turn independently of the outer barrel.

I claim as my invention- 1. A tubular drill having a cylinder free to turn' independently of the barrel, and a Wedge piece or pieces carried by and adapted to a seat or seats in said free eylinder,.sub stantially as setiforth.

2. Atubular drill having a cylinder carrying grasping-fingers, and awedging piece or pieces carriedf'by and adapted to slide in said cylinder, the latter being free to turn independently of the barrel ofthe drill.

The combination ofthe barrel of a drill, having a shoulder, b, above t'ne bit, and a coupling for the drill-rod, with a cylinder free to turn in the barrel between said shoulder and coupling, and a wedging-piece carried by and adapted to slide in the cylinder, all substantially as described.

4L. The combination of the barrel of a drill with a cylinder free to turn therein, the said cylinder being in two parts, one carrying spring-fingers and the other a Wedging piece or pieces, substantially as specified.

5. The combination of the barrel of a drill with a cylinder free to turn in the barrel, and having a groove or grooves with tapered seats, and a Wedging piece or pieces adapted to slide in the groove or grooves.

6. A tubular drill having a cylinder and a Wedging pieceV or pieces adapted to a seat or seats on one side of said cylinder, the latter being free to turn independently of the barrel of the drill, substantially as set forth.

In testimony whereof I have signed my naine to this specification in the presence of two subscribing witnesses.

JOHN P. GRISCOM.

Vitnesses:

J. H. FisTER, MORGAN REED. 

